"It's one of the most important advances in public health that the world has ever seen."

Right now, Castle Rock relies mostly on non-renewable groundwater. That supply will eventually run out.

"And that's why Castle Rock is doing this."

This renewable water plant will eventually expand to meet 75 percent of the town's demands.

"We hope eventually to be able to treat 12 million gallons a day through this plant."

While the thought of transforming treated toilet water to tap water may leave some with a bad taste in their mouth, Marlowe says these high tech filters guarantee the water is clean and safe.

In fact, he says most of today's tap water is reused.

"Everybody lives downstream of somebody."

The town expects this $22 million investment, along with water conservation, will help the town save to up to $100 million over the next 20 years. And perhaps more importantly, it'll help conserve billions of gallons of our most precious resource.

"The state continues to develop and we've got to provide for the long-term future of the residents here in Castle Rock as well as around the state."

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